Derrick



July 10, 1928.

M F m Patented July -10, 1928.

UNITED STATES PATENT OFFICE.

JonN. 'n-ncEwnN, or rrrrsnone'n, 'rnNNsYLvANm, ASSIGNOR. o LEE 0. moons & COMPANY, INCORPORATED, or PITTSBURGH, PENNSYLVANIA, A CORPORATION or PENNSYLVANIA.

DERRICK.

Application filed April 19, 1926. Serial No. 102,900.

This invention relates to structural steel derricks for oil, gas and other wells, and more particularly to a reenforcing structure forderricks and other structural elements of 6 a like character y In a copending application Serial No. 102,- 899 filed April 19, 1926, I have described 'means' for reenforcing structural steel derricks or the like by providing detachable 10 reenforcing columns which are secured to the derrick posts or columns by suitable clamping brackets to produce a composite colunm having alarge radius of gyration for increasing the strength of a derrick for certain operations such asdrilling and pull- 4 ing casing, the reenforcing elements being adapted for removal and use on other derrickswhen the derrick is utilized for lighter working operations such as pumping.

The present invention relates to reenforcing members for structural steel derricks or the like, and difiers from that set forth in .the above-mentioned copending application in the manner of attaching the reenforcing members to the derrick posts or structural steel columns, it being among the. objects of this invention to provide a simple form of connecting members for securing the reenforcing structure to the main derrick structure. g y I My present invention, like the aforemen- I tidned application, provides a reenforced derrick column produced by a particular arrangement and assembly of structural steel parts-to form a compositecolumn having a relatively large radius'o f gyration to obtain increased strength in the column for a given cross-sectional area of metal.

In the accompanying drawing constitut- 40 inga part hereof,- and in which like reference characters designate like parts, Fig. 1 is an elevational view of a structural steel derrick embodying the principles of my invention; Fig. 2 is an enlarged elevatlonal view of a portion-of the reenforced derrick column; and Fig. 3 is a transverse sectional view of the column taken along the line III-III, Fig. 2.

V The derrick shown in Fig. 1 comprises the usual angle corner columns 1 to which there aresecured braces 2 and struts 3 arranged to constitute panels. The left hand'column of the derrick represents a post such as normally used for pumpin and minoroperating functions, and the right hand column illustrates the application of a reenforcingthe apex of the derrick column 1 but has its back facing inwardly of the derrick. The

reenforcing angle bar 4 is secured to the.

angle. bar 1 by a plurality-of substantially channel-shaped clamping bars 5 having overlapping edges 6 for engaging the ends of the angle bars. The members 5 are formed to engage the backs of the angle bars over a relatlvely large area to provide rigidity, and

they may be held in their proper spaced relation by a clamping block 7 having openings therein in alignment with openings in the clamping bars adapted to receive clamping bolts 8 by means of which the angle bars, clamping bars and block 7 are severally joined to constitute a unitary composite derrick column. The clamping bars 5 as shown in Fig. 2 are employed in short sections preferably. in the region of the as shown in Fig. 1.

The lateral spacing of the angle bars 1 and 4' and the dimensions of the block 7 and clamping bars 5 may be varied for altering panelpoints 9 I the spaced apart relation of the angle bars v to afford reenforced columns having difi'erent radii of gyration.

It is evident from the foregoing description of my invention that a reenforcing,

readily permitting'the assembling and disassembling of the reenforcing elements. The reenforcing structure is of such, design as will permit the interchangeable use of parts with other derricks of similar construction so as to'permit of the application of the reenforcing members to different derricks in the same field of operation in accordance with the service requirements for which the derricks are used. 7

Although I have described a specific embodiment of my invention it will be obvious to those skilled in the art that the shapes and proportions of the reenforcing and clamping members may be varied without departing from the principles herein set forth, for instance the clamping block 7 may be dispensed with without altering the disposition of the angle bars and the cooperating clamping members.

I claim:

1. In a derrick structure comprisingcolumns formed by two angle bars placed back to back and spaced apart in parallel relation, means for connecting the angle bars comprising a block adapted to be positioned between the .angle barsand having opposite grooves for receiving the corners of the bars and having a bolt hole positioned transversely to the plane of said grooves, a pair of clamps each adapted to engage the adjaintermediate portion of said clamps being adapted to fit between and bear against the adjacent legs of the angle bars, the clamps being perforated at their middle points, and

a boltadapted to connect the clamps where by to hold the angle bars in properly spaced parallel connected relation.

3. In a derrick structure comprising columns formed by two angle bars placed back to back and spaced apart in parallel relation means for connecting the angle bars, said means comprising pairs ofclamps having their ends turned upon themselves to form hooks adapted to engage adjacent edges of the parallel angle bars, the intermediate portion of said clamps being adapted to fit between and bear against adjacent legs of the angle'bars, the c amps being perforated at their middle points and a bolt adapted to connect the clamps and to draw them together against the angle bars, whereby to hold the angle bars in properly spaced parallel connected relation, and means between the angle bars to positively space them apart and to furnish an abutment for the clamps thereon. 4. In a derrick structure comprising columns formed by two angle bars placed back to back and spaced apart in parallel relation, means for connecting the angle ,bars, said means comprising pairs of clamps having their ends turned ,upon themselves to form terminal hooks adapted to engage adjacent edges of parallel angle bars, the intermediate' portion of said clamps being turned inward at anglesadapting the outer portions of the clamps near the hooks to lie against the backs of the angle bars and so to form positive abutments therefor, and

means to hold the clamps in position on the angle bars, whereby to positively space apart and connect the angle bars.

In testimony whereof, I sign my name.

' JOHN D. MOEWEN. 

